If Lohan goes vegan for the entirety of her remaining rehab stint, PETA will chip in $10,000. The animal rights organization will throw in an additional $10,000 if she remains a vegan for a year afterward.

"As you know, a crucial part of any recovery is showing charity to others," PETA's Michelle Cho wrote in a letter to Lohan, who previously made the group's worst-dressed list in 2008 for wearing fur. "One way to do this is to be kind to animals, the Earth, and your own body. You'll never regret it." The group is also sending a vegan care-package of sorts to Lohan, including a Paul McCartney-narrated DVD about slaughterhouses called "Glass Walls" and a vegetarian/vegan starter kit.

"Lindsay Lohan is the most visible example of a real addict, and if she can conquer her addiction to meat and cheese, absolutely anyone can," said Ingrid Newkirk, PETA's president and co-founder.

RadarOnline.com quoted an unnamed source described as being close to Lohan as saying that she is "seriously considering the offer from PETA. There is thoughtful consideration about PETA's very generous offer. Lindsay loves animals, and looks at it as a 'win-win' since being a vegetarian is a healthier lifestyle that she is striving for."